The recent experiments performed in the hydraulic cutting laboratory from the University of Petrosani were based on cleaning the surfaces with continuous hydraulic jets of medium and high pressure. Using this procedure the sedimented slag from the furnace doors and the paint on the metallic objects have been cleaned. The paper also presents a cleaning equipment adaptable to an industrial ievel. Another preoccupation is represented by polishing the roof glass with abrasive hydraulic jets, the abrasive being a special abrasive clay, the caolin, used not only by specialised industrial processes but also in manual polishing.
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